KEB COMBIVERT F5-A, Applications Manual, Page: 248 / 552

Page 7.8 - 10 COMBIVERT F5-A, -E, -H © KEB, 2012-10
Torque display and -limiting
7.8.3.2.3 Shifting of the limiting characteristic
The physical torque limiting characteristic of the motor is depending on the maximum output voltage of the
inverter. This is determined by the DC link voltage, which is depending on the mains input voltage and the
inverter load.
Therefore different modes can be selected in dS.03 for the programmed limiting characteristic.
dS.03: Current-/torque mode
Bit Meaning Value Explanation
2, 3
DC link depending shif-
ting of the characteristic
(SM)
0: off Shifting generally not active
4: on Shifting generally active
8: >Un(FI) = off, ab-
normal stopping =
off
Shifting not active if DC link voltage higher than ra-
ted voltage (also at emergency stop)
12: >Un(FI) = off,
abnormal stopping
= on Shifting at abnormal stopping generally active,
otherwise inactive if DC link voltage higher than ra-
ted voltage
The value 0 ("off") can be used if the limiting characteristic for the mains input voltage is programmed, the ma-
chine is operated with it, and this voltage is relatively constant.
The advantage (e.g., during ramp-up at the torque limit) is that the continuous, load-dependent fluctuations of
the intermediate circuit cannot cause any torque fluctuations.
If, however, the mains input voltage is variable (e.g., affected by other users) or if the mains voltage at the lo-
cation of the machine is unknown, dS.03 equal 4, 8 or 12 must be selected.
Then the programmed limiting characteristic is always valid for the inverter rated voltage (400V or 230V) and is
proportional adjusted to the voltage.
Fig. 7.8.3.2.3 Shifting limiting characteristic
Drehzahl [U/min]
Maximales Drehmoment [Nm]
maximal erreichbares Moment
bei 400V Netzeingangsspannung
maximal erreichbares Moment
bei 360V Netzeingangsspannung
The limiting characteristic must always be programmed higher than the speed range where the motor shall be
operated. Otherwise, the drive operates in an undefined range at lower DC link voltage values due to the shift